Lépicier was born in Vaucouleurs, France. He joined the Order of Servants of Mary on 1 March 1878 in London. He attended the Seminary of Saint-SulpiceParis and the Pontifical Urban University "De Propaganda Fide" in Rome. He was ordained to the priesthood on 19 September 1885 in London. He served as Master of novices from 1890 until 1892 and was a faculty member of Pontifical Urbanian Athenaeum "De Propaganda Fide," from 1892 until 1913. He served as Rector of the Servite College, Rome from 1895 until 1913 and was General Procurator of his order in 1901. He was appointed Apostolic visitor and delegate to Scotland by Pope Pius X and was in Scotland in 1912–1913.